Table 3 Data recorded during the study period

Ventilation/respiration parameters^a

– Respiratory support technique

– PEEP/CPAP (cmH₂O)

– Peak inspiratory pressure (PIP, cmH₂O)

– Flow (L/min)

– FiO₂ (%)

– Respiratory rate (acts/min)

– Transcutaneous O₂ blood saturation (SatO_{2 TC} %)

– Capillary/arterial blood gas test

– Episodes of apnea (> 20 s or > 5 s if followed by bradycardia/desaturation), bradycardia (Heart rate ≤ 80 bpm) and desaturation (SatO_{2 TC} ≤ 80%)/day

– Silverman score

Feeding parameters^b

– Parenteral nutrition intake (mL/kg/day)

– Enteral nutrition intake (mL/kg/day)

– Total caloric intake (Kcal/kg/day)

– Type of milk: human milk or formula

– Modality of feeding (bolus, gavage, continuous feeding)

– Modality of fortification (if any; type of fortifier: standard, target, or adjustable fortification)

– Enteral feeding interruptions (episodes/day)

– Not given feeds (episodes/day)

– Pathologic gastric residual volumes (episodes/day)

– Vomits and/or regurgitations (episodes/day)

– Abdominal distention (medium score/day)

Auxological parameters^c

– Weight (g)

– Length (cm)

– Cranial circumference (cm)

Overall health status parameters^d

– Patent ductus arteriosus

– Intraventricular hemorrhage

– Leukomalacia

– Retinopathy of prematurity

– Pneumothorax

– Blood transfusion

– NEC

– Intestinal perforation